Combined recorder and reproducer



May 7, 1929- I N. H. HOLLAND I 1,711,680

COMBINED RECORDER AND REPRODUCER Filed April V50, 1926 Patented May 7, 1929.

UNITED STATES NEWMAN H. HGLLAND, ELEUrRIc COMPANY, NEW Yonx.

Application iled April 30,

of lateral movement to permit it to follow the grooves of the record, while no lateral movement should be permitted the recording stylus. Various methods have been suggested for performing the above functions one such being disclosed in my Patent No. 1,283,771,

J which:

dated November' 5, 1918.

An object of this invention is the provision of an arrangement in which a. single elect-romagnetic unit is combined with a recording and a reproducing stylus so that either stylus may easily be brought into operation. A further object is the provision of means which automatically adjusts the pressure between whichever stylus is in the operative position and the record, and which permits slight lateral movement to the reproducing stylus when it is operating and maintains the recording stylus rigid during its operation.

A feature of this invention is a weighted member pivotally supporting an arm which carries both the recording and the reproducing stylus. Cooperating wit-h the weighted member are two sets of knife edges so arranged as to adjust the force applied to the operating stylus, one set of knife edges maintaining the weighted member and stylus arm rigidwith respect to lateral movement, while the other set permits slight lateral movement. This lateral movement is permitted by providing a swivel support for one set of knife edges.

' These and other features will be more clearly understood from the following description in connection with the attached drawings in Fig. 1 is a side view in partial section of. a machine to which one embodimentof the invention has been applied, and shows the recording stylus in its operating position, Fig. 2 is a view similar to Fig. 1 showing the reproducing stylus in operating position, Fig. 3 is a projection showing the underside of the weight member and the arrangement of the cooperating knife edges, Fig. 4 shows an OF EAST ORANGE, NEW JERSEY, .ASSIGNOR T0 WESTERN INCORPORATED, 0F NEW YORK, N. Y., A CORPORATION 0F COMBINED RECORDER AND REPRODUOER.

1926. Serial No. 105,745.

alternative arrangement of the invention and also one form of the wiring connections to the electromagnetic unit for both reproducing and recording, and Fig. 5 shows a side View of a part of the arrangement of Fig. 4 with certain parts cut away to make the operation of this mechanism more clear.

Referring particularly to Fig. 1, the main frame or bed of the phonograph has extensions 11 and 12 substantially as shown. There are two of these extensions, one at each end of the phonograph frame, but only those at one end are shown. Supported between the two extensions 11 1s a fixed rod or shaft 13 and silida-bly mounted thereon is an arcuate arm 14 which carries the electromagnetic unit and the weight member with the attached stylus arm. The main supporting member 16 of the electromagnetic unit is pivoted to arm 14 at point 15 and has a downwardly extending arm 18 which supports the knife edge mechanism. A stop piece 77 cooperates with member 67 to hold he electromagnetic unit in the desired posiion.

Extensions 12 of the frame 1() support the feed screw 20 and also a fixed rod 23. The feed screw 20 moves arm 14 together with its attached mechanism by means ofthe feed-nut` 21 and extension piece 22 which is permanently fastened to a projection of arml 14, substantially as shown. This arrangement allows the disengagement of feed-nut 21 from the feed screw 20 when the arm 14 is moved about rod 13 in a clockwise direction. Also supported by the frame member 10vis a record or receiving cylinder 24, a record 25 being shown in position on the cylinder.

The electromagnetic unit shown as enclosed in a cover 17 in Figs. 1 and 2 is shown in detail in Fig. 4. It consists of a fixed magnet 28 between the pole pieces of which an armature 26 is mounted for oscillation. Pivotally connected to armature 26 is a connecting member 29 which, at its lowerend is pivotally connected to stylus arm 30,'which in turn is pivotally connected to the weighted member 19 at 32.

The windings 27 associated with the armature 26 in one case receive currents, thereby causing the armature to oscillate, which, due to member 29 and arm 30 cause the recording stylus to cut into the blank; while in the other case,

the movement of the reproducing stylus is communicated through arm 30 and member 29 to armature 26, thereby causing currents to be 4generated in the windings.

To permit the lateral movement necessary when reproducing, the knife edge 36 is provided with a swivel support comprising two extensions 38. Knife edge 36 is also provided with a semi-cylindrical disc 37 which fits into a slot 53 eut partially into the Weighted member. The slot 53 and the position of the disc are shown more clearly in Fig. 3. i

The knife edges are brought into play by means of arm 45, rigidly attached to the knife edge supporting member. 54 which is Divotally secured in the frame extension 18 at 35. Arm 45 at its upper end is pivotally connected to a rod 44 which in turn is pivotally connected at 46 to an arm 43. A roller 47 is mounted on the pivot 46 and is arranged to cooperate with cam 48.

Cam 48 is provided with a spring member which is pivotally connected at 66 to the downwardly extending portion of member 67 which is rigidly fastened to arm 14. An extension piece 50 shaped substantially as shown is provided with an opening at its lower end through which an extension piece 51 of weighted member 19extends. Spring 65 and extension piece 50 slide along rod 23 as the entire carriage is moved.

As shown in Fig. 1 knife edge 41 is supporting weighted member 19. In this position the weighted member is almost balanced soathat but slight weight is applied to the recording stylus 33. In this position the wires to the electromagnetic unit, which are shown in' Fig. 4, are connected so that the" windings 27 will have currents passing through them induced from the circuit of the transmitter 55. Sound vibrations enterin transmitter 55 will be changed to electric vibrations which will actuate the armature of the electromagnetic unit, thereby causing these vibrations to be recorded on the record blank. It is not believed that the circuit connections of Fig. 4 need any further explanation.

. When it is desired to reproduce what has been recorded on the blank, arm 43 is moved in a counter-clockwise direction, moving knife edge and removing knife edge 41 from operation with groove 42.

As arm 43 changes itsposition, roller 47 will depress cam 48 against the force exerted by spring 50 which is supported on rod 23. When roller 47 is in notch 49 of the cam, neither knife edge is in position to roperly support the weighted member. am 48,

' however, has been sufficiently depressed to raise extension '50 so that it supports Athe weighted member by means of extension piece 51. In this position, the stylus arm 30, since it is attached to the weighted member, is held 36 into operation with groove 40 In reproducing, theI recorded vibrations are` transmitted through arms 30 and 29 to the armature 26 and its oscillation generates currents in the windings 27 which, with the key 56 in the position shown in Fig. 4 will actuate the diaphragm of receiver 57 giving sound vibrations. It is, of course, understood that receiver 57 may be replaced with amplifying devices and a loud speaker utilized, if desired. u

In the arrangement illustrated in Figs. 4 and 5 4the knife edges 68 and 69 support the weighted member 19 on flat sides, knife edge 69 being permanently fixed to the Weighted member, while the member 19 rests loosely on the fiat side of the member 68. The supporting members 60 have notches or grooves in which the knife edges are supported. They are pivotally connected at 70 to the carriage 58 and are provided with slots 72 on the lower edges to cooperate with studs -61 which are rigidly fixed in a downwardly extending p0rtion of stationary frame members 71. Carriage 58 is supported byI means of bolts 73 fixedl in the frame members 71, and slots 74, in the upper portion of the side members of the carriage, permit the carriage to move back and forth. l

As shown in Fig. 4 knife edges 68 are supgported bythe members 60 and the reproducing stylus 34 is in position to contact 'with the record. In this position a large 'portion of thev weightof the member 19 is exerted on stylus 34 as is required for reproducing. Also spring piece 63 is in its lower position, together with rod-64, thereby closing only that circuit which includes the windings 27 and the receiver 57.

To bring the recording stylus into operation the carriage 58 is drawn into the posi-y tion shown in Fig. 5. The pivot points or studs 70 move with the carriage while studs 61 remain stationary.' Member 60 therefore takes the positionshown in Fig. 5 with the knife edges 69 supporting the weighted member 19. yIn this position the weighted member is nearly balanced so that there is but slight pressureexerted n the recording stylus which is now in the operating position. Also spring 63 has been forced up by carriage 58 and it in turnv has forced up rod 64 to close .the upper contacts of key 56, thereby disconnecting receiver 57 'but connecting the transmitting circuits.

To permit the lateral movement required lwhen reproducing, knife edges G8 are supvention, which is to be limited only by the appended claims.

lVhat is claimed is:

`l. In a sound reproducing and recording machine, an arm, a reproducing and a iecording stylus thereon, a weighted supporting member for said arm, and movable hearings cooperating with said supporting member to y cause either thereproducing or the recording stylus to be effective.

2. In a sound reproducing and recording machine, an arm. a reproducing and a recording stylus on said arm, a weighted supporting member to which-said arm is pivotally connected,v bearings cooperating with said supporting member, a swivel support for one of said bearings, and a rigid support for the other.

3. In a sound reproducing and recording machine, an arm, a reproducing and a recording stylus thereon, a supporting member to which said arm' is pivotally connected and bearing members cooperating with said supporting member, and means associated with said bearing members for holding said arm and said support member rigid When said recording stylus is effective and for permitting slight lateral movement of said arm and said supporting member when said reproducing stylus is effective.

4. In a sound reproducing and recording machine,.an arm, a reproducing stylus and a recording stylus thereon, a weighted member to which said arm is pivotally connected, bearing members having knife edges forA saidsupporting member, a swivel support for certain of said bearing members and a rigid support for the other:

5. In a sound reproducing and recording machine, an arm, a stylus for reproducing and a stylus for recording thereon, a Weighted member to Which said arm is pivotally con-I nected, two sets of knife edge supports for said weighted member, means associated with one of said sets of knife edge supports for holding said arm and said weighted meinber rigid when said recording stylus is effective, and means associated with the other set of knife edges for permitting slight lateral movement of said arm and said Weighted member when said reproducing stylus is efective'l 6. In combination, a weighted member, a

stylus arm, a recording stylus and a reproducl ing stylus on said arm, interchangeable bearing supports for said Weighted member, and means to shift said weighted member from one to the other of said bearing supports to therebybring into operative position either l said recording or said reproducing stylus and to automatically apply the required force on the stylus in the operative position.

7. In combination, a Weighted member, a stylus 'arm pivotally connected thereto, a recording stylus and a reproducing stylus on said arm, a pivotal member, two sets of knife edge supports for said weighted member,vand means to move said pivotal member to cause on'eor the other ofsaid sets of knife edges to supportv said Weighted member to thereby bring either the recording or the reproducing stylus into operative position and tosimul taneously apply the required weight to the operating stylus.`

In Witness whereof, I hereunto subscribe my name this 27th day of April, A. D., 1926. 

